Analysis of air bearing torsion pendulum moment of inertia measurements including nonlinear oscillation and damping

Wang Jun; Zheng Liu; Wang YixuMiao NaZhang Xiaolin

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Analysis of air bearing torsion pendulum moment of inertia measurements including nonlinear oscillation and damping

机译：Analysis of air bearing torsion pendulum moment of inertia measurements including nonlinear oscillation and damping

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摘要

For precise measurement of the moment of inertia (MOI) of asymmetric objects, using an air bearing torsional pendulum, the nonlinearity of the torsion bar and the damping effect caused by the interaction between air and sample need to be included in the analysis. The instantaneous undamped natural frequency and instantaneous damping coefficient of the motion are obtained from the Hilbert transform of the angular displacement signal and are used for data fitting to calculate the MOI. Measurements for algorithm verification were made using a special sample with large windvanes to increase the damping effect. The nonlinear analysis of the MOI experimental results indicated a relative error of less than 0.1% compared with 0.3% for classical linear analysis of the data.

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来源
《Review of Scientific Instruments》 |2023年第6期|065106-1-065106-11|共11页
作者
Wang Jun; Zheng Liu; Wang YixuMiao NaZhang Xiaolin;
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作者单位

School of Instrumentation Science and Engineering, Harbin Institute of Technology;

Software Evaluation and Engineering Department, Institute of Computer Technology and Application;

National Road and Bridge Engineering Testing Equipment Metering Station, Research Institute of Highway Ministry of Transport;

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Analysis of air bearing torsion pendulum moment of inertia measurements including nonlinear oscillation and damping

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